Dust-valve for air-brakes



No. 622,522. Patented Apr. 4, I899. J. MGDOUGAM. 81. J. PERRIE.

DUST VALVE FUR AIR BRAKES.

(Application filed 31111532, 1898.)

{No Model.)

qmil weoozo I m: uonms PETERS cu woYo-u'mo, \VASHNGTON, a. c.

7 Units Sarns JAMES MUDOUGALL, OF BUFFALO, AND JOHN PERRIE, OF DEPElV,NE\V YORK.

DUST l/ALVE FOR AIR-BRAKES.

QPEGIFICATION forming part of Letters Patent N 0. 622,522, dated April44:, 1899.

Application filed June 22,1898. Serial No. 684,142. (No model.)

To all whom it may concern.-

Be it known that we, Jnnns MCDOUGALL, residing at Buffalo, and JOHNPERRIE, residin at Depew, in the county of Erie and State of New York,citizens of the United States, have invented certain new and usefulImprovements in Dust-Valves for Air-Brakes; and we do declare thefollowing to be a full, clear, and exact description of the invention,such as will en able others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the figures of reference marked thereon, which form a part ofthis specification.

- Our invention relates to an improvement in valves for air-brakes; andit consists in a valve-seat made of any suitable material and applied toeach half of the coupling and a spring-actuated valve which extendsthrough the seat, and which valve is provided with a perforated tubethrough which the air passes to the spring-actuated valve, combined witha removable cap which is applied to the outer side of the coupling and aspring-actuated Valve that is applied to this cap and through whichvalve the air escapes when the pressure reaches a certain regulated deree while the main valve is closed, all

The objects of our invention are to vprovide air-brakes with valveswhich are absolutely dust and moisture proof; to apply a springactuatedrelief-valve to the cap. and through which the air is free to escapewhen the main valve is closed and the pressure exceeds a certainregulated degree; to connect to the main valve a telescoping perforatedtube which when the main valve is opened moves or closes into-the largertube, so as to close the opening through the movable one, and thusrelieve the smaller valve from air-pressure; to connect to the mainvalve an arm which has its outer end to pass over a guiding-rod,'so thatthe valve can be forced inwardly when the opposite or partner connectionis not equipped with a valve constructed as here shown and described,and to provide mien be more fully described hereinafter.

Figure 1 represents a vertical section of an air-brake hose connectionwhich embodies our invention. Fig. 2 is a detail view of the cap,showing the perforations. Fig? 3 is a vertical crosssection takenthrough the plate 9.

1 represents the frame of the air-brake hose connection, which isprovided with the reinovouter end 8 of the, tube 6 projects entirely.

through the Valve-seat any desired distance and is adapted to beactuated when the two parts of the brake'are brought together, no matterWhether the opposite or partner connection is provided with a protrudingportion 8 of the valve or not. To the outer end of the tube is securedthe arm 9 by means of the screw 9', and the outer end of this arm 9slides freely upon the guiding-rod 10, which extends vertically betweenthe outer face of the casing 1 and the coupling-flange 11, formedthereon. 'When the two parts of the coupling are brought together, ifboth of them are provided with valves such. as here shown the outer ends8, by coming in contact, force both of the valves inwardly, so as toopen the valves and allow a free passage of air from one part into theother through the opening through which the closed end 8 of the tube 6projects. The air then passes over the valve-seat and-around the end 8of the tube, which is forced into the body sufficiently far to allow theair to freely pass around it. In order to form an absolutely tightjoint, when the parts are in their normal position, as shown in Fig. 1,a packing 20 may be placed around the end of the tube 6 outside of thevalve 7, as shown; This packing 20 is not absolutely necessary, for thevalve 7 upon its seat 4 forms an air-tight joint. The seat 4 may beformed of rubber or any other suit- ICO able material which will answerthe purpose. As the valve 7 is formed as a part of the tube 6, thevalve-seat 4 is preferably made of rubber. The packing 20 also serves toassist the valve in centering itself upon its seat, as the packing isplaced upon the tube 6 and always moves therewith.

Should one of the parts of the coupling not be provided with theprotruding end 8, the face of the opposing coupling will strike againstthe rod or arm 9 and force the valve 7 open and hold it so, so that aircan freely pass through. The rod or arm 9 is made very thin, and as itextends across the opening which is closed by the packing 20 only on oneside and does not come actually in contact with the under side of thevalve-seat it does not obstruct the free passage of the air from onepart of the coupling to'the other. The valve is made removable from thetube, and the valve-seat is made removable from the. casin g, so thatshould either one of the parts become injured or get out of order it canbe readily replaced. placed the large spring 12, which holds the valve 7tightly against the valve-seat 4, and through the tube'is made anysuitable number of holes 13, through which the air freely passes, whenthe valve 7 is closed, toward the spring-actuated valve 14, so as toescape when the pressure exceeds a certain regulated degree. The largerstationary portion of the tube 5, connected with thecap, is justsufficiently large to allow the end of the tube 6 to close into it,andwhen the valve is opened to its full extent the openings 13 are closedby the pipe '5, so as to shut off the air-pressure from the small valve14:.

In the pipe 5 is placed the valve-seat 15, against which the valve letcloses, and which valve is held normally closed by the spring 16. Aroundthe center of the cap is a suitable number of openings 17, through whichthe air passes which escapes through the valve 14:.

By removing the cap 2 and detaching the rod or arm 9 by the removal ofthe holdingscrew all of the removable parts can be gotten at for thepurpose of repair, so that should any of the portions become injured orworn out they can be instantly replaced by others. IVhen the valve 7 isopened, the air-pressure is shut off from the valve 14, and when theInside of the tube 6 is' valve 7 is closed the air passes through theopenings 13, and if the pressure is sufiiciently great it can open thevalve 14, and thus relieve the pressure upon the hose.

By means of our construction the valve is dust and moisture proof underall circumstances.

Having thus described our invention, we claim 1. An air-brake couplingprovided with an automatic relief-valve-, from which the pressure of theair is shut off when the main valve is opened, substantially asdescribed.

2. An air brake coupling, each part of which is provided with a mainvalve for controlling the passage of air from one part of the couplingto the other, combined with an automatically-acting relief-valve fromwhich the pressure is shut off when the main valves are opened,substantially as set forth.

3. In an air-brake coupling, a spring-actuated valve placed upon anendwise-moving perforated tube, combined with a stationary tube intowhich the movable tube closes, and an automatic relief-valve placed inthe stationary tube, substantially as specified.

4:. In an air-brake, an endwise-moving tube carrying a valve, and avalve-seat, combined with the rod or arm attached to the outerprojecting end of the tube, and the guide for the outer end of the rodor arm, substantially as shown. l

5. In a coupling for an air-brake valve, a removable cap provided with astationary inwardly-projecting tube, and an automatic relief-valveplaced in said tube, combined with an endwise-moving perforated tube, aspring for actuating the movable tube, a valve secured to the tube, avalve-seat applied to the casing, and a rod or arm projecting from theouter projecting end of the movable tube, the

parts being arranged to operate so that when the main valve is opened,the air-pressure is shut off from the relief-valve, and vice versa,substantially as set forth.

In testimony whereof We aifiX our signatures in presence of twowitnesses.

his JAMES X MODOUGALL.

mark JOHN PERRIE. Witnesses F. HOWARD MASON, IDA FEE THoMER.

